package com.atguigu.gulimall.auth.controller;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnum;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegistVo;
import com.netflix.ribbon.proxy.annotation.Http;
import org.apache.catalina.User;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import javax.validation.constraints.NotEmpty;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @author 蔡心怡
 * @version 1.0
 */
@Controller
public class LoginController {

    @Autowired
    ThirdPartFeignService thirdPartFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    MemberFeignService memberFeignService;

    /**
     * 发送一个请求直接跳转到一个页面。
     * SpringMVC viewcontroller；将请求和页面映射过来.
     *
     */
    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone) {

        // TODO 1. 接口防刷


        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if (!StringUtils.isEmpty(redisCode)) {
            long l = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - l < 60000) {
                // 60 秒内不能再发
                return R.error(BizCodeEnum.SMS_CODE_EXCEPTION.getCode(), BizCodeEnum.SMS_CODE_EXCEPTION.getMsg());
            }
        }


        // 2. 验证码的再次校验。redis 存key为 sms:code:手机号，值为验证码
        String code = UUID.randomUUID().toString().substring(0, 5);
        // redis 缓存验证码， 防止同一个 phone 在 60 秒内再次发送验证码; 验证码有效时间为 10 分钟
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone, code  + "_" + System.currentTimeMillis(), 10, TimeUnit.MINUTES);



        thirdPartFeignService.sendCode(phone, code);
        return R.ok();
    }

    /**
     * // TODO 重定向携带数据，利用 session 原理，将数据放在 session 中。
     * 只要跳到下一个页面取出这个数据以后， session 里面的数据就会删掉
     *
     * // TODO 1. 分布式下的 session 问题
     * RedirectAttributes redirectAttributes 模拟重定向携带数据
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result, RedirectAttributes redirectAttributes) {
        if (result.hasErrors()) {
//            .map(fieldError -> {
//                String field = fieldError.getField();
//                String defaultMessage = fieldError.getDefaultMessage();
//                errors.put(field, defaultMessage);
//                return
//            })
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage, (oldValue,newValue)->newValue));
//            model.addAttribute("errors",errors);
            redirectAttributes.addFlashAttribute("errors",errors);
            //Request method 'POST' not supported
            //用户注册->/regist[post]----》转发/reg.html（路径映射默认都是get方式访问的。）

//            session.set
            //校验出错，转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }

        // 1. 校验验证码
        String code = vo.getCode();


        String key = AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone();
        String s = redisTemplate.opsForValue().get(key);
        if (!StringUtils.isEmpty(s)) {
            // 验证码通过
            if (code.equals(s.split("_")[0])){
                // 删除验证码; 令牌机制
                redisTemplate.delete(key);
                // 真正注册，调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if (r.getCode() != 0) {
                    // 失败
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg", r.getData("msg", new TypeReference<String>(){}));
                    redirectAttributes.addFlashAttribute("errors", errors);
                    //校验出错，转发到注册页
                    return "redirect:http://auth.gulimall.com/reg.html";
                }



                // 注册成功回到首页，回到登录页
                return "redirect:http://auth.gulimall.com/login.html";
            }
        }

        Map<String, String> errors = new HashMap<>();
        errors.put("code", "验证码错误");
        redirectAttributes.addFlashAttribute("errors", errors);
        //校验出错，转发到注册页
        return "redirect:http://auth.gulimall.com/reg.html";

    }
    @GetMapping("/login.html")
    public String loginPage(HttpSession session){
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute != null) {
            // 已经登录过
            return "redirect:http://gulimall.com";
        }
        return "login";
    }

    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session){

        // 远程登录
        R login = memberFeignService.login(vo);
        if (login.getCode() != 0) {
            // 失败
            Map<String, String> errors = new HashMap<>();
            errors.put("msg", login.getData("msg", new TypeReference<String>(){}));
            redirectAttributes.addFlashAttribute("errors", errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }
        MemberRespVo data = login.getData("data", new TypeReference<MemberRespVo>() {
        });
        // 将用户数据放入 session 中
        session.setAttribute(AuthServerConstant.LOGIN_USER, data);
        return "redirect:http://gulimall.com";

    }
}


